[audio] persistent device volume control

src/audio_core/sink/cubeb_sink.cpp

@@ -261,6 +261,7 @@ SinkStream* CubebSink::AcquireSinkStream(Core::System& system, u32 system_channe
     system_channels = system_channels_;
     SinkStreamPtr& stream = sink_streams.emplace_back(std::make_unique<CubebSinkStream>(
         ctx, device_channels, system_channels, output_device, input_device, name, type, system));
+    stream->SetDeviceVolume(device_volume);
 
     return stream.get();
 }
@@ -280,14 +281,11 @@ void CubebSink::CloseStreams() {
 }
 
 f32 CubebSink::GetDeviceVolume() const {
-    if (sink_streams.empty()) {
-        return 1.0f;
-    }
-
-    return sink_streams[0]->GetDeviceVolume();
+    return device_volume;
 }
 
 void CubebSink::SetDeviceVolume(f32 volume) {
+    device_volume = volume;
     for (auto& stream : sink_streams) {
         stream->SetDeviceVolume(volume);
     }

src/audio_core/sink/null_sink.h

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -38,6 +41,7 @@ public:
                                   StreamType type) override {
         if (null_sink == nullptr) {
             null_sink = std::make_unique<NullSinkStreamImpl>(system, type);
+            null_sink->SetDeviceVolume(device_volume);
         }
         return null_sink.get();
     }
@@ -45,9 +49,14 @@ public:
     void CloseStream(SinkStream*) override {}
     void CloseStreams() override {}
     f32 GetDeviceVolume() const override {
-        return 1.0f;
+        return device_volume;
+    }
+    void SetDeviceVolume(f32 volume) override {
+        device_volume = volume;
+        if (null_sink != nullptr) {
+            null_sink->SetDeviceVolume(volume);
+        }
     }
-    void SetDeviceVolume(f32 volume) override {}
     void SetSystemVolume(f32 volume) override {}
 
 private:

src/audio_core/sink/sdl3_sink.cpp

@@ -246,6 +246,7 @@ SinkStream* SDLSink::AcquireSinkStream(Core::System& system, u32 system_channels
     system_channels = system_channels_;
     SinkStreamPtr& stream = sink_streams.emplace_back(std::make_unique<SDLSinkStream>(
         device_channels, system_channels, output_device, input_device, type, system));
+    stream->SetDeviceVolume(device_volume);
     return stream.get();
 }
 
@@ -264,14 +265,11 @@ void SDLSink::CloseStreams() {
 }
 
 f32 SDLSink::GetDeviceVolume() const {
-    if (sink_streams.empty()) {
-        return 1.0f;
-    }
-
-    return sink_streams[0]->GetDeviceVolume();
+    return device_volume;
 }
 
 void SDLSink::SetDeviceVolume(f32 volume) {
+    device_volume = volume;
     for (auto& stream : sink_streams) {
         stream->SetDeviceVolume(volume);
     }

src/audio_core/sink/sink.h

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -96,6 +99,8 @@ public:
     }
 
 protected:
+    /// Master volume, persists stream lifetimes
+    f32 device_volume{1.0f};
     /// Number of device channels supported by the hardware
     u32 device_channels{2};
     /// Number of channels the game is sending

src/core/hle/service/cmif_serialization.h

@@ -243,7 +243,7 @@ constexpr RequestLayout GetReplyOutLayout(bool is_domain) {
     return is_domain ? GetDomainReplyOutLayout<MethodArguments>() : GetNonDomainReplyOutLayout<MethodArguments>();
 }
 
-using OutTemporaryBuffers = std::array<boost::container::small_vector<u8, 128>, 3>;
+using OutTemporaryBuffers = std::array<Common::ScratchBuffer<u8>, 3>;
 
 template <typename MethodArguments, typename CallArguments, size_t PrevAlign = 1, size_t DataOffset = 0, size_t HandleIndex = 0, size_t InBufferIndex = 0, size_t OutBufferIndex = 0, bool RawDataFinished = false, size_t ArgIndex = 0>
 void ReadInArgument(bool is_domain, CallArguments& args, const u8* raw_data, HLERequestContext& ctx, OutTemporaryBuffers& temp) {
@@ -345,9 +345,9 @@ void ReadInArgument(bool is_domain, CallArguments& args, const u8* raw_data, HLE
             // Set up scratch buffer.
             auto& buffer = temp[OutBufferIndex];
             if (ctx.CanWriteBuffer(OutBufferIndex)) {
-                buffer.resize(ctx.GetWriteBufferSize(OutBufferIndex));
+                buffer.resize_destructive(ctx.GetWriteBufferSize(OutBufferIndex));
             } else {
-                buffer.resize(0);
+                buffer.resize_destructive(0);
             }
 
             ElementType* ptr = (ElementType*) buffer.data();
@@ -456,7 +456,7 @@ void CmifReplyWrapImpl(HLERequestContext& ctx, T& t, Result (T::*f)(A...)) {
     static_assert(ConstIfReference<A...>(), "Arguments taken by reference must be const");
     using MethodArguments = std::tuple<std::remove_cvref_t<A>...>;
 
-    OutTemporaryBuffers buffers; //don't zero init
+    OutTemporaryBuffers buffers{};
     auto call_arguments = std::tuple<typename UnwrapArg<A>::Type...>();
 
     // Read inputs.